Then mouse over one of the results, you will notice that some new link appears "share"

This will allow you to share the site and give it a +1 vote without the site needing to add the usual code for a +1 button.

This leads me the think that they must use this data in a different part of their algo. So if you can game this system by inflating the vote count directly from the search results, you should see it have a positive effect on your search engine rankings.

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